package com.longy.nio;

import org.junit.Test;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.Date;
import java.util.Iterator;
import java.util.Scanner;

public class TestNonBlockingNIO2 {
    @Test
    public void send() throws IOException {
        DatagramChannel dc = DatagramChannel.open();

        dc.configureBlocking(false);

        ByteBuffer buf = ByteBuffer.allocate(1024);

        Scanner scan = new Scanner(System.in);

        while (scan.hasNext()){
            String next = scan.next();
            buf.put((new Date().toString()+"\n"+next).getBytes());
            buf.flip();
            dc.send(buf,new InetSocketAddress("127.0.0.1",9898));
            buf.clear();
        }

        dc.close();
    }

    @Test
    public void receive() throws IOException {
        DatagramChannel dc = DatagramChannel.open();

        dc.configureBlocking(false);

        dc.bind(new InetSocketAddress(9898));

        Selector selector = Selector.open();

        dc.register(selector, SelectionKey.OP_READ);

        while (selector.select()>0){
            Iterator<SelectionKey> it = selector.selectedKeys().iterator();

            while (it.hasNext()){
                SelectionKey sk = it.next();

                if (sk.isReadable()){
                    ByteBuffer buf = ByteBuffer.allocate(1024);
                    dc.receive(buf);
                    buf.flip();

                }
            }
            it.remove();
        }
    }
}

